期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 165, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2020.120714
关键词
Particle; Transient heat conduction; Deformation; Pebble bed; Finite element; Discrete element
资金
- National Science and Technology Major Project [2011ZX06901003]
- National High Technology Research and Development Program of China (863) [2014AA052701]
- National Natural Science Foundations of China [51576211]
- fund of Nuclear Power Technology Innovation Centre [HDLCXZX2020-HD-022]
The new DEFEM method effectively solves the contact force, heat conduction, and movement of particles. Compared to traditional methods, DEFEM has significant advantages in terms of speed and efficiency.
A new discrete element-embedded finite element method (DEFEM) scheme is proposed here, which solves the contact force and heat conduction of particles with embedded discrete elements (EDE), employs the finite element method (FEM) to get the deformation and internal temperature change of particles with heat and stress on the boundary and employs the discrete element method (DEM) to obtain the movement of particles. The DEFEM is characterized by coupling the deformation, motion and heat conduction of particles .Compared to either merely DEM or pure FEM, DEFEM combines the solution ideas of the FEM and DEM, and avoids the problem of overlapping and penetration of mesh elements in FEM. DEFEM also supports parallel computing, which is about three times faster than a pure FEM solution. As a demonstration, we developed an in-house code to perform DEFEM to simulate the extrusion and heat conduction of packed pebble bed, in comparison with a pure FEM solution for reference. Based on the numerical results, the characteristics of particle deformation and heat transfer in different extrusion speeds and layers are discussed. (C) 2020 Elsevier Ltd. All rights reserved.
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